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authorRafael J. Wysocki <rjw@sisk.pl>2011-04-11 22:54:42 +0200
committerRafael J. Wysocki <rjw@sisk.pl>2011-04-11 22:54:42 +0200
commit1f112cee07b314e244ee9e71d9c1e6950dc13327 (patch)
treee089e646c78701e37b4ebe00db36082e47cab2d5 /include
parentb42282e5a05018ecdc0d63a4ad530b0999785912 (diff)
downloadlinux-1f112cee07b314e244ee9e71d9c1e6950dc13327.tar.bz2
PM / Hibernate: Introduce CONFIG_HIBERNATE_CALLBACKS
Xen save/restore is going to use hibernate device callbacks for quiescing devices and putting them back to normal operations and it would need to select CONFIG_HIBERNATION for this purpose. However, that also would cause the hibernate interfaces for user space to be enabled, which might confuse user space, because the Xen kernels don't support hibernation. Moreover, it would be wasteful, as it would make the Xen kernels include a substantial amount of code that they would never use. To address this issue introduce new power management Kconfig option CONFIG_HIBERNATE_CALLBACKS, such that it will only select the code that is necessary for the hibernate device callbacks to work and make CONFIG_HIBERNATION select it. Then, Xen save/restore will be able to select CONFIG_HIBERNATE_CALLBACKS without dragging the entire hibernate code along with it. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Tested-by: Shriram Rajagopalan <rshriram@cs.ubc.ca>
Diffstat (limited to 'include')
-rw-r--r--include/linux/suspend.h11
1 files changed, 3 insertions, 8 deletions
diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index 5a89e3612875..083ffea7ba18 100644
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -249,6 +249,8 @@ extern void hibernation_set_ops(const struct platform_hibernation_ops *ops);
extern int hibernate(void);
extern bool system_entering_hibernation(void);
#else /* CONFIG_HIBERNATION */
+static inline void register_nosave_region(unsigned long b, unsigned long e) {}
+static inline void register_nosave_region_late(unsigned long b, unsigned long e) {}
static inline int swsusp_page_is_forbidden(struct page *p) { return 0; }
static inline void swsusp_set_page_free(struct page *p) {}
static inline void swsusp_unset_page_free(struct page *p) {}
@@ -297,14 +299,7 @@ static inline bool pm_wakeup_pending(void) { return false; }
extern struct mutex pm_mutex;
-#ifndef CONFIG_HIBERNATION
-static inline void register_nosave_region(unsigned long b, unsigned long e)
-{
-}
-static inline void register_nosave_region_late(unsigned long b, unsigned long e)
-{
-}
-
+#ifndef CONFIG_HIBERNATE_CALLBACKS
static inline void lock_system_sleep(void) {}
static inline void unlock_system_sleep(void) {}